905 / 1024
An unintended “potential incident” was found:
•
in ~3 % of all plans, during primary check
•
in ~½ % of all plans, during secondary check
Actual incidents = accidents:
•
in ~¼ % of cases
For each actual incident, ~14 potential incidents were found
through checking.
An incident frequency of 3% could be seen in a “typical clinic”.
From IAEA database of radiation incidents
Independent calculation checks 1998-2003 on 27830 charts/plans